World-life; or, Comparative geology . are nebulas withtolerably definite circu-lar outlines, and consisteither of a uniform disc,as defined by Herschel,or of a rudely annularor spiral belt surround-ing a faint luminosity,which often contains oneor more bright bright belt is often fringed by a coma or a bur oflight. H. 2,241, as shown in Figure 12, consists of a welldefined- belt of light surroundedby an irregular coma, but withouta nucleus. H. 464 shows a brightring of the spiral order. It issurrounded by a bur of light,and has two nuclei which scarce-ly sustain any relations to the
World-life; or, Comparative geology . are nebulas withtolerably definite circu-lar outlines, and consisteither of a uniform disc,as defined by Herschel,or of a rudely annularor spiral belt surround-ing a faint luminosity,which often contains oneor more bright bright belt is often fringed by a coma or a bur oflight. H. 2,241, as shown in Figure 12, consists of a welldefined- belt of light surroundedby an irregular coma, but withouta nucleus. H. 464 shows a brightring of the spiral order. It issurrounded by a bur of light,and has two nuclei which scarce-ly sustain any relations to thegeneral structure. H. 838, Fig-ure 13, has a ring of light consist-ing of a double bami of the spiralorder. It is surrounded by a burof light, and contains two nucleisymmetrically situated, and surrounded each by a darkzone, a luminous haze and a bright ring. The planetarynebula in Aquarius (H. 2,098), consists of a sphere ofluminosity surrounded by a fringe of rays. From eachside of the sphere projects a protuberance equal in length. Fig. 12. Planetary Nebula, H. 2,-i41 Without a Nucleus. NEBUL.^. 47
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherchica, bookyear1883
